What is the general trend globally for increasing species richness?
A. Increasing from east to west across continental land masses.
B. Increasing from polar areas towards the tropics.
C. Increasing from tropical seas into temperate forests.
D. Increasing from the tropics towards polar areas.
E. Increasing from clay soil types into organic soils.
B. Increasing from polar areas towards the tropics.
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All of the following are parts of the sperm except
a. mitochondria. b. a nucleus. c. a flagellum. d. a diploid set of chromosomes. e. an acrosome.
Most true fungi send out cellular filaments called
a. mycelia. b. hyphae. c. mycorrhizae. d. stolons. e. rhizoids.
Which of the following is CORRECT about bacterial ribosomes?
A. They have two subunits and contain three RNA molecules. B. They are a single complex without subunits, and contain three RNA molecules. C. They have three subunits each containing an RNA molecule. D. They have two subunits, the smaller one composed of protein only, and the larger one composed of RNA only. E. They are a single complex containing one large RNA molecules and several proteins.
Immunoglobulins and TCRs associate with adaptor molecules that have
A) a C domain. B) immune-based tyrosine-activation motifs (ITAMs). C) pathogen recognition receptors. D) toll-like receptors.